Dan,
Glad to hear that the locking bolt turned out well, especially without having to play around with the dovetailed piece.
Your order of operations is pretty close. First, the sear spring pins are the same pins that the cocking bar rock on. So, you first have to place the cocking bar into the receiver. It is far easier to install the sear springs before the sears themselves.
Once the cocking bar and sear springs are installed, raise the rear leaf on the springs and "wedge-in" the sear. The spring pressure will hold it in place. Rock it left to right as you force it forward and it will make it's way into alignment with the hole for the pin. Screw it in place and you're ready to go.
Two other things to mention:
1) The hammers should have a bevel toward the outside to lower the profile in allowance of the firing pin retaining screws. Before installing the hammers, make sure that the screws are in far enough to retain the pins no matter if they rotate (the pins' retaining collars may not be perfectly circular), but not so far that the hammer will strike them, crushing the threads.
2) The trip pin and trip spring are last before seating the trigger plate.
Nice pictures, by the way. And no apologies for length of post required. I'm sure that I have posted twice as much on the subject. Besides, it's a fun project to rebuild/restore a piece of functional art. Especially when it's of American vintage. I read a bit of excitement in what you're doing and can very much appreciate it.
Also, out of curiosity, what are your plans for the finish on the receiver? Leaving it polished as is?
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